Quote:
Originally Posted by Jeremy5848
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The "trimming plug" in the 1985 W123/OM617 is for the smog stuff only. There is no electrical connection to control the IP (like there is in later cars), only a "rack position sensor." The "trimming plug" is wired directly to the "control unit" which has some control over the vacuum lines -- but only for the various smog devices, AFAIK, as shown in the circuit diagram posted earlier. .... |
Regarding the trimming plug Jeremy. I understand what you are saying about the rack position sensor but in this post, M-Shop member Bstef says
otherwise on post #11…. Maybe controlling the emissions output also has some effect on the idle. (Pic #1 of the trimming plug is from Bstef)
Quote:
Originally Posted by johninva
…. Where is the ovp relay located ? How does the kilma relay play into the scenario ?
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The OVP relay is found behind the glove compartment. Check the fuse there. See pic #2 from Bstef on the attachment.
The Kilma Relay controls the A/C compressor. It starts and shuts it down. My theory is a possibility the Kilma disrupting the OVP Relay which causes the Tach and A/C not to work.